Which immature type specimens are you referring to for A. africanus
and H. habilis? I was under the impression that we had enough fossil
evidence to say with some degree of certainty that A. africanus
represents the gracile line of australopithecine. H. habilis is a bit
more difficult to establish as one species, since the fossils
associated with this taxon show a large range of anatomical
variability.

It seems that in most of my evolution texts both of these species (if
in fact there are only two) are discussed briefly and then set aside
in favor of the better known A. afarensis and H. erectus.